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BG board
BG board
Aperture selector (S1)
Select the boost frequency, 4.5 MHz or 6.5 MHz,
for aperture correction. This selector is factory-
preset to 4.5 MHz.
QA and QB boards
The QA board is located behind the VIDEO A,
VIDEO B and EXT SYNC INPUT connector panel
and the QB board is located behind the R/R-Y, GI
Y/TEST and B/B-Y INPUT connector panel. To
access these boards, remove the INPUT connector
panels, referring to Section 2.
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Ground mode selectors (S1, S2, S3)--t-m
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QA and QB boards
Ground mode selectors (S1, S2, S3)
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The selectors on the QA board correspond to the
VIDEO A, VIDEO B or EXT SYNC INPUT
connectors and those on the QB board correspond
to the R/R-Y, G/Y/TESTor B/B-Y connectors,
respectively.
S (nonfloating): Factory-preset position.
Normally keep the selectors at this position.
F (floating): When there is hum in the input
signal to be monitored, set to this position.
Common mode noise will be rejected.
1. Operation
11-21
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